A Class for Linking Matrices by Columns or Rows
This class treats a list of matrix-like objects that are linked together by
columns (ColumnLinkedMatrix
) or rows (RowLinkedMatrix
) and
have the same number of rows similarly to a regular matrix
by
implementing key methods such as [
and [<-
for extracting and
replacing matrix elements, dim
to retrieve dimensions, and
dimnames
and dimnames<-
to retrieve and set dimnames. Each
list element is called a node and can be extracted or replaced using
[[
and [[<-
. A matrix-like object is one that has two
dimensions and implements at least dim
and [
.
Internally, this class is an S4 class that contains list
. Each node
can be accessed using the [[
operator. lapply
is also
possible. ColumnLinkedMatrix
and RowLinkedMatrix
form a
class union called LinkedMatrix
.
[
[<-
dim
dimnames
dimnames<-
as.matrix
is.matrix
length
print
str
cbind
(for ColumnLinkedMatrix
)
rbind
(for RowLinkedMatrix
)
ColumnLinkedMatrix
and RowLinkedMatrix
to
create a ColumnLinkedMatrix
and RowLinkedMatrix
objects from
scratch. as.ColumnLinkedMatrix
and
as.RowLinkedMatrix
to create a ColumnLinkedMatrix
and
RowLinkedMatrix
objects from other objects.
LinkedMatrix
to create an empty, prespecified
LinkedMatrix
object. nNodes
to get the number of
nodes of a LinkedMatrix
object.
# Create various matrix-like objects that correspond in dimensions m1 <- ff::ff(initdata = rnorm(50), dim = c(5, 10)) m2 <- bigmemory::big.matrix(init = rnorm(50), nrow = 5, ncol = 10) m3 <- matrix(data = rnorm(50), nrow = 5, ncol = 10) # Link random matrices by columns cm <- ColumnLinkedMatrix(m1, m2, m3) dim(cm) # Link random matrices by rows rm <- RowLinkedMatrix(m1, m2, m3) dim(rm) # Get the number of nodes of each linked matrix nNodes(cm) nNodes(rm) # Extract specific rows of linked matrix cm[1, ] cm[1:3, ] rm[1, ] rm[1:3, ] # Extract specific columns of linked matrix cm[, 1] cm[, 1:3] rm[, 1] rm[, 1:3] # Extract specific rows and columns of linked matrix cm[1, 1] cm[1:3, 1:3] rm[1, 1] rm[1:3, 1:3] # Get a reference to one of the nodes n <- cm[[2]] class(n) == "big.matrix" # LinkedMatrix objects are matrix-like and can be nested rcm <- RowLinkedMatrix(cm, cm)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.